'Teen Mom' Amber Portwood -- Back in Jail

Amber Portwood

Back in the Slammer

12/19/2011 11:44 AM PST BY TMZ STAFF

"Teen Mom" Amber Portwood has been thrown back in jail -- this after a judge issued a warrant for her arrest today, TMZ has learned.

It's unclear why the judge issued the warrant -- whether it's related to Amber's most recent alleged probation violations, including a fight Amber got into at a restaurant last month ... or a new one entirely.

Amber is currently being booked at Madison County Jail in Indiana -- where she's now expected to spend the holidays.

She's due to face a judge on January 13. The booking photo was first obtained by FOX59 in Indianapolis.

HERE'S THE RUNDOWN Meredith Viera Defends the Killer of Cecil the Lion Jennifer Beals in a Hot-Dog-in-Car Controversy A 'Bachelorette' Star Gets Bashed in the Head with a Brick Zayn Malik is Goin' Solo Thanks to Simon Cowell